AutoChief 4 Propulsion Control System Sulzer RTA engines, Denis6

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AutoChief 4Propulsion Control System Sulzer RTA
engines, Denis-6

• (DENIS Diesel Engine conNtrol and optImizing
  Specification).

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The propulsion control system

• For remote control of the main engine
• From telegraph and maneuvering lever in the
  wheelhouse and control room.
• It will automatically
• start,
• reverse,
• stop
• speed setting signal to the governor.

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AutoChief

• Propulsion control system provided by Kongsberg
  Norcontrol for SULZER RTA 2-stroke low speed
  diesel engines with fixed propeller

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Functionality

• Start, stop and reversing are done
  electro/pneumatically,
• the speed control are done electrically by the
  governor system.
• A safety system is with shut down, slow down and
  emergency stop functions as standard.

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• Maneuvering
• Automatic maneuvering by telegraph lever in
  wheelhouse and control room by electric signals.
• Start/Stop/ Reversing
• Automatic controlled by telegraph lever in
  wheelhouse and control room,by pneumatic valves
  on main engine.  
• Speed control
• Automatic controlled, setpoint transferred from
  telegraphlever in wheelhouse, through remote
  control system to the governor.
• Back-up control
• By a speedsetting dial and selector switches in
  control room back-up (panel, electric signals

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• Safety system
• Automatic shutdown from sensors on main engine.
• Automatic slowdown from sensors on main engine.
• Manual emergency stop, from switches on
  bridge/c.room/eng. side 
• Telegraph
• Handle type transmitter/receiver on bridge.
• Handle type transmitter/receiver in control room.
• Order printer
• Logs the telegraph and remote control system
  orders, such as telegraph/sub. telegraph
  position, control position, critical alarms and
  RPM. Event, periodic, status and startup log.

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Main functions (1)

• Cylinder pre/post lubrication
• A push-button activates a solenoid valve which
  allows the lub.oil pump to be driven by the
  crosshead bearing oil, this giving cylinder
  prelubrication for an adjustable time (30 sec.).
  
•    Slow turning
• This function is activated manually by operating
  a push-button on the bridge panel or the engine
  control room panel.

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Main functions (2)

• Start interlocks
• Start of main engine is interlocked when one or
  more of the following conditions is present
• Turning gear engaged
• Start air press low
• RPM detector failure
• There are two pick-up systems so system to will
  be selected automatically.
• Safety system stop
• Indicates that a shut down is active.
• Safety system off
• It is not allowed to run the main engine without
  a safety system

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Start of main engine

• The system will open for start air by the Start
  Valve, and close the start air by means of the
  Start Cut off Valve when the start speed is
  reached.
• If the start attempt fails, the system will
  repeat the start sequence two more times.
• The additional start attempts will be carried out
  with increased start setpoint (heavy start),
• If all three start attempts fails, 3 failed
  starts alarm will be activated

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Start parameters
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Start failures (1)

• 3 Start attempts failed
• This indicates that three start attempts is used
  and the engine failed to start
• Start Time Limit
• This indicates that the MEs RPM could not pass
  above the Start RPM level for normal start within
  the specified Start time Limit
• Slow Turning Fail.
• This indicates that the Slowturning sequence
  prior to a start was not successful.

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Start failures (2)

• Brake Time Limit
• When the engine get a reverse order from a
  running condition, brake air is engaged.
• If the breaking air is not sufficient to reduce
  the engine rpm to stop within the brake time
  limit, the breaking air will cut and the remote
  control system will await until next breaking
  attempt is made.
• This could be the situation if the ship is fully
  loaded and the speed through the water is
  relatively high.
• This is called Windmilling.

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Maneuvering

• For maneuvering, the maneuver lever has the
  following steps.
• Ahead D.Slow - Slow - Half - Full - Max. Ahead
• Stop
• Astern D.Slow - Slow - Half - Full - Max. Astern

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Sea mode / Maneuvering mode

• SEA MODE gives order for 0-100 of MCR,
• MANEUVERING MODE gives 0-70 of MCR.

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RPM Breakpoint

• Rpm limits
• 25.8
• 51.5
• 67.0
• 94.8
• 107.1
• Speed program
• Speed up/down

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Engine control

• Ahead/astern reversing.
• Reversing of the main engine is activated when
  the bridge maneuvering lever is set to ahead or
  astern direction.
• The system will activate the reversing valves, to
  reverse the camshaft, and then start the engine
•   Stop of main engine.
• The engine are stopped simply by setting the
  lever in control to STOP position.
• The fuel zero order signal is activated to the
  governor to set the fuelrack in zero position.
• As a back up for the stop function, emergency
  stop switch is provided hardwired directly to
  the safety system.

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VIT/FQS control function

• VIT (Variable Injection Timing)
• FQS (Fuel Quality Setting).
• The purpose of the VITFQS is to keep the firing
  pressure at 100 in the upper load range.
• The system uses the charge air pressure and the
  engine speed as input signals to this control
  function
• The VITFQS actuator placed on the main engine in
  accordance with curves specified in the Denis-6
  specification

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VIT
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SAFETY SYSTEM (SSU-8810),
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Overspeed detection via RPM detection system

• RPM is detected from RPM pickups mounted at
  engine gearwheel inside engine
• Detection of OVERSPEED
• via the RPM detector system,
• stop of the engine via digital output for
  emergency stop solenoid valve
• ROUGH SEA MODE
• when a overspeed is detected first activate the
  stop valve,
• when the RPM is decreased to a certain level, the
  valve is deactivated, and the engine will
  continue to run

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Shut down

• Inputs for 6 shut down sensors, Output for
  activation of emergency stop valve.  
• Sensor failure detection for all shut down
  sensors, broken wire/short circuit, or "out of
  range" detection for analogue sensors.
• Standard shut down parameters, specified by
  Wärtsila NSD is as follows
• Main bearing oil, pressure very low.
• Main bearing oil, pressure low.
• Cylinder cooling water inlet, pressure low.
• Air spring pressure, very low.
• Shut down from alarm system.

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Slow down

• Inputs for 14 slow down sensors,
• Output signal for activate slow down in the
  remote control system
• Sensor failure detection for all slow down
  sensors, broken wire/short circuit, or "out of
  range" detection for analogue sensors
• tandard slow down parameters
• Oil mist in crank case.
• Crosshead bearing oil, pressure low.
• Main bearings oil, pressure low.
• Cylinder cooling water, inlet pressure low.
• Air spring pressure low.
• Slow down from alarm system.

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DIGITAL GOVERNOR
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Regulator

• The regulator is of a PI type.
• During rough sea the derivate function is
  enabled, converting the regulator to a PID type

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Gain function

• Error Band signal gain reduction to suppress low
  amplitude noise. Deadband selectable.
• Governor common-gain adjusting function, to
  select proper damping.
• Automatic adjustment of system integrating gain
  according to engine operating data.
• Automatic adjustment of common gain according to
  engine operating speed.

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The actuator control functions

• Adjustable Servo PI controller.
• Output Scaling for signal adaption to the Motor
  Servo Amplifier.
• Monitoring control signals, and in case of
  failure, block the actuator.
• Distribute fuel-indication to user (fuel index
  indicator may be delivered as an option).